<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>用户注册</title>
</head>
<body>
    <form action="regexCheck.php" method="post">
        用户名<input type="text" name="username" id="username" value=""><br><br>
        email<input type="text" name="email" id="email" value=""><br><br>
        手机号<input type="text" name="mobile" id="mobile" value=""><br><br>
        <input type="submit" value="提交">
    </form>
</body>
</html>